WO2019015184A1 - Threshold voltage regulator circuit and liquid crystal display device - Google Patents
Threshold voltage regulator circuit and liquid crystal display device Download PDFInfo
- Publication number
- WO2019015184A1 WO2019015184A1 PCT/CN2017/111426 CN2017111426W WO2019015184A1 WO 2019015184 A1 WO2019015184 A1 WO 2019015184A1 CN 2017111426 W CN2017111426 W CN 2017111426W WO 2019015184 A1 WO2019015184 A1 WO 2019015184A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- unit
- electrically connected
- turn
- voltage dividing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Definitions
- the present invention relates to the field of display technologies, and in particular, to a turn-on voltage adjustment circuit and a liquid crystal display device.
- LCD Liquid crystal display
- PDA personal digital assistant
- digital camera computer screen Or laptop screens, etc.
- each pixel is electrically connected to a thin film transistor (TFT), a gate of the thin film transistor is connected to a horizontal scan line, a source is connected to a vertical data line, and a drain ( Drain) is connected to the pixel electrode.
- TFT thin film transistor
- a gate of the thin film transistor is connected to a horizontal scan line
- a source is connected to a vertical data line
- a drain ( Drain) is connected to the pixel electrode.
- the gate scan driving circuit is directly fabricated on the thin film transistor array substrate (Gate Driver on Array, GOA) to replace the external gate scan driving IC and the like.
- GOA Gate Driver on Array
- Liquid crystal display panel manufacturers are scrambling to develop hot content to further reduce production costs.
- the GOA technology can use the array process of the liquid crystal display panel to fabricate the gate driving circuit on the TFT array substrate to realize the driving mode of the gate progressive scanning.
- the turn-on voltage is generally a constant high voltage.
- the thin film transistor cannot be normally turned on by the turn-on voltage at normal temperature, so that normal charge and discharge cannot be performed, and the display of the liquid crystal display device is abnormal.
- An object of the present invention is to provide an on-voltage adjustment circuit capable of raising an on-voltage in a low-temperature environment, and which can be normally displayed at a low temperature when applied to a liquid crystal display device.
- Another object of the present invention is to provide a liquid crystal display device capable of rising in a low temperature environment High turn-on voltage ensures normal display at low temperatures.
- the present invention first provides a turn-on voltage adjustment circuit, including a turn-on voltage output unit, a feedback voltage detecting unit electrically connected to the turn-on voltage output unit, and a feedback voltage detecting unit and an open voltage output unit. Electrically connected control unit;
- the turn-on voltage output unit is configured to output an turn-on voltage
- the feedback voltage detecting unit includes a first voltage dividing unit, a second voltage dividing unit, a subtractor, a first switching unit, a second switching unit, and a temperature feedback control unit; the first end of the first voltage dividing unit The output end of the electrical connection opening voltage output unit is connected to the turn-on voltage, the second end is electrically connected to the first end of the second voltage dividing unit; the second end of the second voltage dividing unit is grounded; the phase of the subtractor is The input end is electrically connected to the second end of the first voltage dividing unit, the inverting input end is electrically connected to the first output end of the temperature feedback control unit, and the output end is electrically connected to the first end of the second switching unit; The control end of the switch unit is electrically connected to the second output end of the temperature feedback control unit, the first end is electrically connected to the second end of the first voltage dividing unit, and the second end is electrically connected to the feedback end of the control unit; The control end of the switch unit is electrically connected to the third output end of the temperature
- the control unit is configured to output a corresponding control signal to the turn-on voltage output unit when the voltage of the feedback terminal is less than or greater than a predetermined feedback voltage, and correspondingly control the turn-on voltage output unit to increase or decrease the voltage of the turn-on voltage outputted by the output terminal thereof.
- the temperature feedback control unit includes: a third voltage dividing unit, a fourth voltage dividing unit, a fifth voltage dividing unit, a sixth voltage dividing unit, a comparator, a third switching unit, and a thermistor;
- the first end of the third voltage dividing unit is connected to the first constant voltage, the second end is electrically connected to the first end of the fourth voltage dividing unit, and the second end of the fourth voltage dividing unit is electrically connected to the sixth end.
- a first end of the voltage dividing unit and an inverting input end of the subtractor the first end of the fifth voltage dividing unit is connected to the power supply voltage, and the second end is electrically connected to the first end of the third switching unit;
- the second end of the sixth voltage dividing unit is grounded;
- the non-inverting input end of the comparator is electrically connected to the second end of the third voltage dividing unit, the inverting input terminal is connected to the reference voltage, and the output end is electrically connected to the second switching unit a control end;
- the control end of the third switch unit is electrically connected to the output end of the comparator, the first end is electrically connected to the control end of the first switch unit, and the second end is grounded;
- the first end of the thermistor and The second ends
- the reference voltage is equal to the voltage of the first end of the fourth voltage dividing unit when the ambient temperature of the turn-on voltage adjusting circuit is a preset temperature; the thermistor is a thermistor with a negative temperature coefficient.
- the first switching unit, the second switching unit, and the third switching unit are respectively a first field effect transistor, a second field effect transistor, and a third field effect transistor;
- the gate of the first FET is the control end of the first switching unit, the drain is the first end of the first switching unit, and the source is the second end of the first switching unit;
- the gate of the second FET is the control end of the second switch unit, the drain is the first end of the second switch unit, and the source is the second end of the second switch unit;
- the gate of the third FET is the control end of the third switching unit, the drain is the first end of the third switching unit, and the source is the second end of the third switching unit.
- the first field effect transistor, the second field effect transistor, and the third field effect transistor are all N-type field effect transistors.
- the first voltage dividing unit, the second voltage dividing unit, the third voltage dividing unit, the fourth voltage dividing unit, the fifth voltage dividing unit, and the sixth voltage dividing unit are respectively a first resistor, a second resistor, and a third resistor a fourth resistor, a fifth resistor, and a sixth resistor.
- the control unit is a pulse width modulation chip.
- the present invention also provides a liquid crystal display device comprising the above-described turn-on voltage adjusting circuit.
- the invention also provides a turn-on voltage adjusting circuit, comprising: a turn-on voltage output unit, a feedback voltage detecting unit electrically connected to the turn-on voltage output unit, and a control electrically connected to the feedback voltage detecting unit and the turn-on voltage output unit unit;
- the turn-on voltage output unit is configured to output an turn-on voltage
- the feedback voltage detecting unit includes a first voltage dividing unit, a second voltage dividing unit, a subtractor, a first switching unit, a second switching unit, and a temperature feedback control unit; the first end of the first voltage dividing unit The output end of the electrical connection opening voltage output unit is connected to the turn-on voltage, the second end is electrically connected to the first end of the second voltage dividing unit; the second end of the second voltage dividing unit is grounded; the phase of the subtractor is The input end is electrically connected to the second end of the first voltage dividing unit, the inverting input end is electrically connected to the first output end of the temperature feedback control unit, and the output end is electrically connected to the first end of the second switching unit; The control end of the switch unit is electrically connected to the second output end of the temperature feedback control unit, the first end is electrically connected to the second end of the first voltage dividing unit, and the second end is electrically connected to the feedback end of the control unit; The control end of the switch unit is electrically connected to the third output end of the temperature
- the control unit is configured to output a corresponding control signal to the turn-on voltage output unit when the voltage of the feedback terminal is less than or greater than a predetermined feedback voltage, and correspondingly control the turn-on voltage output unit to increase or decrease the voltage of the turn-on voltage outputted by the output terminal thereof. a value until the voltage at its feedback terminal is equal to the predetermined feedback voltage;
- the temperature feedback control unit includes: a third voltage dividing unit, a fourth voltage dividing unit, a fifth voltage dividing unit, a sixth voltage dividing unit, a comparator, a third switching unit, and a thermistor;
- the first end of the third voltage dividing unit is connected to the first constant voltage, the second end is electrically connected to the first end of the fourth voltage dividing unit, and the second end of the fourth voltage dividing unit is electrically connected to the sixth end.
- a first end of the voltage dividing unit and an inverting input end of the subtractor the first end of the fifth voltage dividing unit is connected to the power supply voltage, and the second end is electrically connected to the first end of the third switching unit;
- the second end of the sixth voltage dividing unit is grounded;
- the non-inverting input end of the comparator is electrically connected to the second end of the third voltage dividing unit, the inverting input terminal is connected to the reference voltage, and the output end is electrically connected to the second switching unit a control end;
- the control end of the third switch unit is electrically connected to the output end of the comparator, the first end is electrically connected to the control end of the first switch unit, and the second end is grounded;
- the reference voltage is equal to a voltage of the first end of the fourth voltage dividing unit when the ambient temperature of the turn-on voltage adjusting circuit is a preset temperature;
- the thermistor is a thermistor with a negative temperature coefficient;
- the first voltage dividing unit, the second voltage dividing unit, the third voltage dividing unit, the fourth voltage dividing unit, the fifth voltage dividing unit, and the sixth voltage dividing unit are respectively a first resistor, a second resistor, and a first resistor a three resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
- control unit is a pulse width modulation chip.
- the invention provides a turn-on voltage adjusting circuit, comprising: an open voltage output unit, a feedback voltage detecting unit, and a control unit, wherein the feedback voltage detecting unit comprises a first voltage dividing unit and a second minute
- the pressure unit, the subtractor, the first switch unit, the second switch unit, and the temperature feedback control unit when the ambient temperature is less than the preset temperature, the temperature feedback control unit controls the first switch unit to be turned off, and the second switch unit is turned on, And inputting a temperature compensation voltage to the inverting input end of the subtractor, the subtractor outputs a difference between the voltage of the second end of the first voltage dividing unit and the temperature compensation voltage to the feedback end of the control unit, and the control unit controls the opening voltage output unit to increase the output thereof.
- the turn-on voltage keeps the voltage of the feedback terminal of the control unit at a preset feedback voltage, and can raise the turn-on voltage in a low temperature environment to ensure that the liquid crystal display device can display normally at a low temperature.
- the invention provides a liquid crystal display device comprising the above-mentioned turn-on voltage adjusting circuit, which can raise the turn-on voltage in a low temperature environment and ensure normal display at a low temperature.
- FIG. 1 is a circuit diagram of a turn-on voltage adjusting circuit of the present invention.
- the present invention provides an open voltage adjustment circuit, including a turn-on voltage output unit 100 , a feedback voltage detecting unit 200 electrically connected to the turn-on voltage output unit 100 , and a feedback voltage detecting unit 200 and an open voltage.
- the output unit 100 is electrically connected to the control unit 300;
- the turn-on voltage output unit 100 is configured to output an turn-on voltage VGH;
- the feedback voltage detecting unit 200 includes a first voltage dividing unit 210, a second voltage dividing unit 220, a subtractor 230, a first switching unit 240, a second switching unit 250, and a temperature feedback control unit 260;
- the first end of the voltage dividing unit 210 is electrically connected to the output end of the voltage output unit 100 to be connected to the opening voltage VGH, and the second end is electrically connected to the first end of the second voltage dividing unit 220;
- the second voltage dividing unit 220 The second end of the subtractor 230 is electrically connected to the second end of the first voltage dividing unit 210, and the inverting input end is electrically connected to the first output end of the temperature feedback control unit 260, and the output end is electrically
- the first end of the first switching unit 250 is electrically connected to the second output end of the temperature feedback control unit 260, and the first end is electrically connected to the first voltage dividing unit 210.
- the second end is electrically connected to the feedback end of the control unit 300; the control end of the second switch unit 250 is electrically connected to the third output end of the temperature feedback control unit 260, and the second end is electrically connected to the control unit 300.
- Feedback end; the temperature feedback control The element 260 is configured to input a temperature compensation voltage to the inverting input terminal of the subtractor 230, and control the first switching unit 240 to be turned off when the ambient temperature of the turn-on voltage adjusting circuit is less than a preset temperature, and the second switching unit 250 Turning on, when the ambient temperature of the turn-on voltage adjusting circuit is greater than or equal to the preset temperature, controlling the first switching unit 240 to be turned on, and the second switching unit 250 to be turned off;
- the control unit 300 is configured to output a corresponding control signal to the turn-on voltage output unit 100 when the voltage of the feedback terminal is less than or greater than a preset feedback voltage, and correspondingly control the turn-on voltage output unit 100 to increase or decrease the output of the output of the output terminal.
- the voltage value of the voltage VGH is until the voltage at its feedback terminal is equal to the preset feedback voltage.
- the temperature feedback control unit 260 includes: a third voltage dividing unit 261, a fourth voltage dividing unit 262, a fifth voltage dividing unit 263, a sixth voltage dividing unit 264, a comparator 265, and a third switching unit 266. And thermistor VR1;
- the first end of the third voltage dividing unit 261 is connected to the first constant voltage VL, the second end is electrically connected to the first end of the fourth voltage dividing unit 262, and the second end of the fourth voltage dividing unit 262 is electrically connected.
- the first end of the sixth voltage dividing unit 264 is connected to the inverting input terminal of the subtractor 230; the first end of the fifth voltage dividing unit 263 is connected to the power supply voltage VDD, and the second end is electrically connected to the third switching unit.
- the first end of the sixth voltage dividing unit 264 is grounded; the non-inverting input end of the comparator 265 is electrically connected to the second end of the third voltage dividing unit 261, and the inverting input terminal is connected to the reference.
- the output end is electrically connected to the control end of the second switch unit 250; the control end of the third switch unit 266 is electrically connected to the output end of the comparator 265, and the first end is electrically connected to the control of the first switch unit 240.
- the first end and the second end of the thermistor VR1 are electrically connected to the first end and the second end of the fourth voltage dividing unit 262, respectively.
- the reference voltage Vref is equal to the voltage of the first end of the fourth voltage dividing unit 262 when the ambient temperature of the turn-on voltage adjusting circuit is a preset temperature; the thermistor VR1 is a negative temperature coefficient thermistor .
- the first switch unit 240, the second switch unit 250, and the third switch unit 266 are a first FET Q1, a second FET Q2, and a third FET Q3, respectively;
- the gate of the FET Q1 is the control end of the first switching unit 240, the drain is the first end of the first switching unit 240, the source is the second end of the first switching unit 240; the gate of the second FET Q2
- the control terminal of the second switch unit 250 is the first end of the second switch unit 250, the source is the second end of the second switch unit 250, and the gate of the third field effect transistor Q3 is the third switch unit 266.
- the control terminal has a drain that is a first end of the third switching unit 266 and a source that is substantially the second end of the third switching unit 266.
- the first field effect transistor Q1, the second field effect transistor Q2, and the third field effect transistor Q3 are all N-type field effect transistors.
- the first voltage dividing unit 210, the second voltage dividing unit 220, the third voltage dividing unit 261, the fourth voltage dividing unit 262, the fifth voltage dividing unit 263, and the sixth voltage dividing unit 264 are respectively the first The resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6.
- control unit 300 is a pulse width modulation chip.
- the third partial voltage The voltage of the second end of the unit 261 is less than the reference voltage Vref, at which time the output of the comparator 265 outputs a low level, the second field effect transistor Q2 is turned off, and the third field effect The tube Q3 is turned off, and the second end of the fifth voltage dividing unit 263 is a high level after the power supply voltage VDD is divided by the fifth voltage dividing unit 263, the first field effect transistor Q1 is turned on, and the turn-on voltage VGH is first divided.
- the unit 210 is divided into the feedback terminal of the control unit 300. At this time, if the voltage of the feedback terminal of the control unit 300 is less than or greater than the preset feedback voltage, the control unit 300 outputs a corresponding control signal to the turn-on voltage output unit 100 to enable the voltage output.
- the unit 100 increases or decreases the output turn-on voltage VGH, so that the voltage at the feedback end of the control unit 300 is equal to the preset feedback voltage, and the voltage at the second end of the first voltage dividing unit 210 is also maintained at a preset feedback voltage;
- the resistance value of the thermistor VR1 is increased, so that the voltage of the second end of the third voltage dividing unit 261 is greater than the reference voltage Vref, and the output of the comparator 265 outputs a high level
- the second The field effect transistor Q2 is turned on, the third field effect transistor Q3 is turned on, the gate of the first field effect transistor Q1 is grounded and turned off, and the subtractor 230 connects the voltage of the second end of the first voltage dividing unit 210 with the fourth voltage dividing unit 262.
- Second end The voltage, that is, the temperature feedback voltage is subtracted, and the operation result is input to the feedback end of the control unit 300, and the control unit 300 can control the voltage value of the turn-on voltage VGH of the output voltage output unit 100 to be adjusted, so that the feedback of the control unit 300
- the pin of the terminal maintains a preset feedback voltage, and when the ambient temperature is less than the preset temperature, the voltage of the second terminal of the first voltage dividing unit 210 is equal to the sum of the preset feedback voltage and the temperature compensation voltage, that is, the first point at this time.
- the voltage of the second end of the voltage unit 210 is greater than a preset feedback voltage, and when the ambient temperature is greater than or equal to the preset temperature, the voltage of the second end of the first voltage dividing unit 210 is always equal to the preset feedback voltage, that is, the ambient temperature.
- the turn-on voltage VGH outputted by the turn-on voltage output unit 100 is higher than the turn-on voltage VGH when the ambient temperature is greater than or equal to the preset temperature, so that the turn-on voltage is raised in a low temperature environment, and the turn-on voltage adjustment circuit is applied to the liquid crystal.
- the device is displayed, it is possible to ensure that the liquid crystal display device can be normally displayed at a low temperature.
- the present invention also provides a liquid crystal display device comprising the above-described turn-on voltage adjusting circuit capable of raising an open voltage in a low temperature environment to ensure normal display at a low temperature.
- the structure of the turn-on voltage adjustment circuit will not be described here.
- the turn-on voltage adjusting circuit of the present invention includes a turn-on voltage output unit, a feedback voltage detecting unit, and a control unit, wherein the feedback voltage detecting unit includes a first voltage dividing unit, a second voltage dividing unit, and a subtraction method.
- the first switching unit, the second switching unit, and the temperature feedback control unit when the ambient temperature is less than the preset temperature, the temperature feedback control unit controls the first switching unit to be turned off, the second switching unit to be turned on, and to the subtractor
- the inverting input terminal inputs a temperature compensation voltage
- the subtracter outputs a difference between the voltage of the second end of the first voltage dividing unit and the temperature compensation voltage to the feedback end of the control unit, and the control unit controls the opening voltage output unit to increase the opening voltage of the output.
- the voltage at the feedback end of the control unit maintains a preset feedback voltage, which can raise the turn-on voltage in a low temperature environment, and ensure that the liquid crystal display device can display normally at a low temperature.
- Liquid crystal display device of the invention The above-mentioned turn-on voltage adjusting circuit can raise the turn-on voltage in a low temperature environment to ensure normal display at a low temperature.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
本发明涉及显示技术领域，尤其涉及一种开启电压调整电路及液晶显示装置。The present invention relates to the field of display technologies, and in particular, to a turn-on voltage adjustment circuit and a liquid crystal display device.
液晶显示装置(Liquid Crystal Display，LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛的应用，如：液晶电视、移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记本电脑屏幕等，在平板显示领域中占主导地位。Liquid crystal display (LCD) has many advantages such as thin body, power saving, no radiation, etc., and has been widely used, such as: LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen Or laptop screens, etc., dominate the field of flat panel display.
主动式液晶显示装置中，每个像素电性连接一个薄膜晶体管(TFT)，薄膜晶体管的栅极(Gate)连接至水平扫描线，源极(Source)连接至垂直方向的数据线，漏极(Drain)则连接至像素电极。在水平扫描线上施加足够的电压，会使得电性连接至该条水平扫描线上的所有TFT打开，从而数据线上的信号电压能够写入像素，控制不同液晶的透光度进而达到控制色彩与亮度的效果。In an active liquid crystal display device, each pixel is electrically connected to a thin film transistor (TFT), a gate of the thin film transistor is connected to a horizontal scan line, a source is connected to a vertical data line, and a drain ( Drain) is connected to the pixel electrode. Applying a sufficient voltage on the horizontal scanning line causes all the TFTs electrically connected to the horizontal scanning line to be turned on, so that the signal voltage on the data line can be written into the pixel, and the transmittance of different liquid crystals is controlled to control the color. With the effect of brightness.
随着液晶显示装置产业制造技术的不断发展，利用阵列制程将栅极扫描驱动电路直接制作在薄膜晶体管阵列基板上(Gate Driver on Array，GOA)来取代外接的栅极扫描驱动IC等技术成为众多液晶显示面板厂商争相开发的热点内容，以进一步降低生产成本。GOA技术可以运用液晶显示面板的阵列制程将栅极驱动电路制作在TFT阵列基板上，实现对栅极逐行扫描的驱动方式。With the continuous development of the manufacturing technology of the liquid crystal display device industry, the gate scan driving circuit is directly fabricated on the thin film transistor array substrate (Gate Driver on Array, GOA) to replace the external gate scan driving IC and the like. Liquid crystal display panel manufacturers are scrambling to develop hot content to further reduce production costs. The GOA technology can use the array process of the liquid crystal display panel to fabricate the gate driving circuit on the TFT array substrate to realize the driving mode of the gate progressive scanning.
现有技术中，一般需要向液晶显示面板输入开启电压(VGH)及关闭电压(VGL)以控制液晶显示面板的像素中的薄膜晶体管、及GOA电路中的薄膜晶体管的开闭。其中，开启电压一般为恒定不变的高电压。然而在低温环境下，利用常温时的开启电压无法正常打开薄膜晶体管，因而无法进行正常的充放电，会导致液晶显示装置的显示异常。In the prior art, it is generally required to input a turn-on voltage (VGH) and a turn-off voltage (VGL) to a liquid crystal display panel to control opening and closing of a thin film transistor in a pixel of a liquid crystal display panel and a thin film transistor in a GOA circuit. Among them, the turn-on voltage is generally a constant high voltage. However, in a low-temperature environment, the thin film transistor cannot be normally turned on by the turn-on voltage at normal temperature, so that normal charge and discharge cannot be performed, and the display of the liquid crystal display device is abnormal.
发明内容Summary of the invention
本发明的目的在于提供一种开启电压调整电路，能够在低温环境下升高开启电压，应用于液晶显示装置时能够保证其在低温下能够正常显示。An object of the present invention is to provide an on-voltage adjustment circuit capable of raising an on-voltage in a low-temperature environment, and which can be normally displayed at a low temperature when applied to a liquid crystal display device.
本发明的另一目的在于提供一种液晶显示装置，能够在低温环境下升 高开启电压，保证在低温下能够正常显示。Another object of the present invention is to provide a liquid crystal display device capable of rising in a low temperature environment High turn-on voltage ensures normal display at low temperatures.
为实现上述目的，本发明首先提供一种开启电压调整电路，包括开启电压输出单元、与开启电压输出单元电性连接的反馈电压侦测单元、及与反馈电压侦测单元及开启电压输出单元均电性连接的控制单元；To achieve the above objective, the present invention first provides a turn-on voltage adjustment circuit, including a turn-on voltage output unit, a feedback voltage detecting unit electrically connected to the turn-on voltage output unit, and a feedback voltage detecting unit and an open voltage output unit. Electrically connected control unit;
所述开启电压输出单元用于输出开启电压；The turn-on voltage output unit is configured to output an turn-on voltage;
所述反馈电压侦测单元包括第一分压单元、第二分压单元、减法器、第一开关单元、第二开关单元、及温度反馈控制单元；所述第一分压单元的第一端电性连接开启电压输出单元的输出端接入开启电压，第二端电性连接第二分压单元的第一端；所述第二分压单元的第二端接地；所述减法器的同相输入端电性连接第一分压单元的第二端，反相输入端电性连接温度反馈控制单元的第一输出端，输出端电性连接第二开关单元的第一端；所述第一开关单元的控制端电性连接温度反馈控制单元的第二输出端，第一端电性连接第一分压单元的第二端，第二端电性连接控制单元的反馈端；所述第二开关单元的控制端电性连接温度反馈控制单元的第三输出端，第二端电性连接控制单元的反馈端；所述温度反馈控制单元用于向减法器的反相输入端输入一温度补偿电压，以及在所述开启电压调整电路的环境温度小于一预设的温度时控制第一开关单元截止、第二开关单元导通，在所述开启电压调整电路的环境温度大于等于所述预设的温度时控制第一开关单元导通、第二开关单元截止；The feedback voltage detecting unit includes a first voltage dividing unit, a second voltage dividing unit, a subtractor, a first switching unit, a second switching unit, and a temperature feedback control unit; the first end of the first voltage dividing unit The output end of the electrical connection opening voltage output unit is connected to the turn-on voltage, the second end is electrically connected to the first end of the second voltage dividing unit; the second end of the second voltage dividing unit is grounded; the phase of the subtractor is The input end is electrically connected to the second end of the first voltage dividing unit, the inverting input end is electrically connected to the first output end of the temperature feedback control unit, and the output end is electrically connected to the first end of the second switching unit; The control end of the switch unit is electrically connected to the second output end of the temperature feedback control unit, the first end is electrically connected to the second end of the first voltage dividing unit, and the second end is electrically connected to the feedback end of the control unit; The control end of the switch unit is electrically connected to the third output end of the temperature feedback control unit, and the second end is electrically connected to the feedback end of the control unit; the temperature feedback control unit is configured to input a temperature compensation to the inverting input end of the subtractor Voltage And controlling the first switching unit to be turned off and the second switching unit to be turned on when the ambient temperature of the turn-on voltage adjusting circuit is less than a preset temperature, where an ambient temperature of the turn-on voltage adjusting circuit is greater than or equal to the preset temperature Controlling the first switching unit to be turned on and the second switching unit to be turned off;
所述控制单元用于在其反馈端的电压小于或大于一预设的反馈电压时向开启电压输出单元输出对应的控制信号，对应控制开启电压输出单元提高或降低其输出端输出的开启电压的电压值直至其反馈端的电压等于所述预设的反馈电压。The control unit is configured to output a corresponding control signal to the turn-on voltage output unit when the voltage of the feedback terminal is less than or greater than a predetermined feedback voltage, and correspondingly control the turn-on voltage output unit to increase or decrease the voltage of the turn-on voltage outputted by the output terminal thereof. The value until the voltage at its feedback terminal is equal to the preset feedback voltage.
所述温度反馈控制单元包括：第三分压单元、第四分压单元、第五分压单元、第六分压单元、比较器、第三开关单元、及热敏电阻；The temperature feedback control unit includes: a third voltage dividing unit, a fourth voltage dividing unit, a fifth voltage dividing unit, a sixth voltage dividing unit, a comparator, a third switching unit, and a thermistor;
所述第三分压单元的第一端接入第一恒定电压，第二端电性连接第四分压单元的第一端；所述第四分压单元的第二端电性连接第六分压单元的第一端及减法器的反相输入端；所述第五分压单元的第一端接入电源电压，第二端电性连接第三开关单元的第一端；所述第六分压单元的第二端接地；所述比较器的同相输入端电性连接第三分压单元的第二端，反相输入端接入参考电压，输出端电性连接第二开关单元的控制端；所述第三开关单元的控制端电性连接比较器的输出端，第一端电性连接第一开关单元的控制端，第二端接地；所述热敏电阻的第一端和第二端分别电性连接第四分压单元的第一端和第二端。 The first end of the third voltage dividing unit is connected to the first constant voltage, the second end is electrically connected to the first end of the fourth voltage dividing unit, and the second end of the fourth voltage dividing unit is electrically connected to the sixth end. a first end of the voltage dividing unit and an inverting input end of the subtractor; the first end of the fifth voltage dividing unit is connected to the power supply voltage, and the second end is electrically connected to the first end of the third switching unit; The second end of the sixth voltage dividing unit is grounded; the non-inverting input end of the comparator is electrically connected to the second end of the third voltage dividing unit, the inverting input terminal is connected to the reference voltage, and the output end is electrically connected to the second switching unit a control end; the control end of the third switch unit is electrically connected to the output end of the comparator, the first end is electrically connected to the control end of the first switch unit, and the second end is grounded; the first end of the thermistor and The second ends are electrically connected to the first end and the second end of the fourth voltage dividing unit, respectively.
所述参考电压等于所述开启电压调整电路的环境温度为预设的温度时第四分压单元第一端的电压；所述热敏电阻为负温度系数的热敏电阻。The reference voltage is equal to the voltage of the first end of the fourth voltage dividing unit when the ambient temperature of the turn-on voltage adjusting circuit is a preset temperature; the thermistor is a thermistor with a negative temperature coefficient.
所述第一开关单元、第二开关单元、第三开关单元分别为第一场效应管、第二场效应管、及第三场效应管；The first switching unit, the second switching unit, and the third switching unit are respectively a first field effect transistor, a second field effect transistor, and a third field effect transistor;
所述第一场效应管的栅极为第一开关单元的控制端，漏极为第一开关单元的第一端，源极为第一开关单元的第二端；The gate of the first FET is the control end of the first switching unit, the drain is the first end of the first switching unit, and the source is the second end of the first switching unit;
所述第二场效应管的栅极为第二开关单元的控制端，漏极为第二开关单元的第一端，源极为第二开关单元的第二端；The gate of the second FET is the control end of the second switch unit, the drain is the first end of the second switch unit, and the source is the second end of the second switch unit;
所述第三场效应管的栅极为第三开关单元的控制端，漏极为第三开关单元的第一端，源极为第三开关单元的第二端。The gate of the third FET is the control end of the third switching unit, the drain is the first end of the third switching unit, and the source is the second end of the third switching unit.
第一场效应管、第二场效应管、及第三场效应管均为N型场效应管。The first field effect transistor, the second field effect transistor, and the third field effect transistor are all N-type field effect transistors.
所述第一分压单元、第二分压单元、第三分压单元、第四分压单元、第五分压单元、第六分压单元分别为第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、及第六电阻。The first voltage dividing unit, the second voltage dividing unit, the third voltage dividing unit, the fourth voltage dividing unit, the fifth voltage dividing unit, and the sixth voltage dividing unit are respectively a first resistor, a second resistor, and a third resistor a fourth resistor, a fifth resistor, and a sixth resistor.
所述控制单元为脉冲宽度调制芯片。The control unit is a pulse width modulation chip.
本发明还提供一种液晶显示装置，包括上述的开启电压调整电路。The present invention also provides a liquid crystal display device comprising the above-described turn-on voltage adjusting circuit.
本发明还提供一种开启电压调整电路，包括开启电压输出单元、与开启电压输出单元电性连接的反馈电压侦测单元、及与反馈电压侦测单元及开启电压输出单元均电性连接的控制单元；The invention also provides a turn-on voltage adjusting circuit, comprising: a turn-on voltage output unit, a feedback voltage detecting unit electrically connected to the turn-on voltage output unit, and a control electrically connected to the feedback voltage detecting unit and the turn-on voltage output unit unit;
所述开启电压输出单元用于输出开启电压；The turn-on voltage output unit is configured to output an turn-on voltage;
所述反馈电压侦测单元包括第一分压单元、第二分压单元、减法器、第一开关单元、第二开关单元、及温度反馈控制单元；所述第一分压单元的第一端电性连接开启电压输出单元的输出端接入开启电压，第二端电性连接第二分压单元的第一端；所述第二分压单元的第二端接地；所述减法器的同相输入端电性连接第一分压单元的第二端，反相输入端电性连接温度反馈控制单元的第一输出端，输出端电性连接第二开关单元的第一端；所述第一开关单元的控制端电性连接温度反馈控制单元的第二输出端，第一端电性连接第一分压单元的第二端，第二端电性连接控制单元的反馈端；所述第二开关单元的控制端电性连接温度反馈控制单元的第三输出端，第二端电性连接控制单元的反馈端；所述温度反馈控制单元用于向减法器的反相输入端输入一温度补偿电压，以及在所述开启电压调整电路的环境温度小于一预设的温度时控制第一开关单元截止、第二开关单元导通，在所述开启电压调整电路的环境温度大于等于所述预设的温度时控制第一开关单元导通、第二开关单元截止； The feedback voltage detecting unit includes a first voltage dividing unit, a second voltage dividing unit, a subtractor, a first switching unit, a second switching unit, and a temperature feedback control unit; the first end of the first voltage dividing unit The output end of the electrical connection opening voltage output unit is connected to the turn-on voltage, the second end is electrically connected to the first end of the second voltage dividing unit; the second end of the second voltage dividing unit is grounded; the phase of the subtractor is The input end is electrically connected to the second end of the first voltage dividing unit, the inverting input end is electrically connected to the first output end of the temperature feedback control unit, and the output end is electrically connected to the first end of the second switching unit; The control end of the switch unit is electrically connected to the second output end of the temperature feedback control unit, the first end is electrically connected to the second end of the first voltage dividing unit, and the second end is electrically connected to the feedback end of the control unit; The control end of the switch unit is electrically connected to the third output end of the temperature feedback control unit, and the second end is electrically connected to the feedback end of the control unit; the temperature feedback control unit is configured to input a temperature compensation to the inverting input end of the subtractor Voltage And controlling the first switching unit to be turned off and the second switching unit to be turned on when the ambient temperature of the turn-on voltage adjusting circuit is less than a preset temperature, where an ambient temperature of the turn-on voltage adjusting circuit is greater than or equal to the preset temperature Controlling the first switching unit to be turned on and the second switching unit to be turned off;
所述控制单元用于在其反馈端的电压小于或大于一预设的反馈电压时向开启电压输出单元输出对应的控制信号，对应控制开启电压输出单元提高或降低其输出端输出的开启电压的电压值直至其反馈端的电压等于所述预设的反馈电压；The control unit is configured to output a corresponding control signal to the turn-on voltage output unit when the voltage of the feedback terminal is less than or greater than a predetermined feedback voltage, and correspondingly control the turn-on voltage output unit to increase or decrease the voltage of the turn-on voltage outputted by the output terminal thereof. a value until the voltage at its feedback terminal is equal to the predetermined feedback voltage;
其中，所述温度反馈控制单元包括：第三分压单元、第四分压单元、第五分压单元、第六分压单元、比较器、第三开关单元、及热敏电阻；The temperature feedback control unit includes: a third voltage dividing unit, a fourth voltage dividing unit, a fifth voltage dividing unit, a sixth voltage dividing unit, a comparator, a third switching unit, and a thermistor;
所述第三分压单元的第一端接入第一恒定电压，第二端电性连接第四分压单元的第一端；所述第四分压单元的第二端电性连接第六分压单元的第一端及减法器的反相输入端；所述第五分压单元的第一端接入电源电压，第二端电性连接第三开关单元的第一端；所述第六分压单元的第二端接地；所述比较器的同相输入端电性连接第三分压单元的第二端，反相输入端接入参考电压，输出端电性连接第二开关单元的控制端；所述第三开关单元的控制端电性连接比较器的输出端，第一端电性连接第一开关单元的控制端，第二端接地；所述热敏电阻的第一端和第二端分别电性连接第四分压单元的第一端和第二端；The first end of the third voltage dividing unit is connected to the first constant voltage, the second end is electrically connected to the first end of the fourth voltage dividing unit, and the second end of the fourth voltage dividing unit is electrically connected to the sixth end. a first end of the voltage dividing unit and an inverting input end of the subtractor; the first end of the fifth voltage dividing unit is connected to the power supply voltage, and the second end is electrically connected to the first end of the third switching unit; The second end of the sixth voltage dividing unit is grounded; the non-inverting input end of the comparator is electrically connected to the second end of the third voltage dividing unit, the inverting input terminal is connected to the reference voltage, and the output end is electrically connected to the second switching unit a control end; the control end of the third switch unit is electrically connected to the output end of the comparator, the first end is electrically connected to the control end of the first switch unit, and the second end is grounded; the first end of the thermistor and The second end is electrically connected to the first end and the second end of the fourth voltage dividing unit respectively;
其中，所述参考电压等于所述开启电压调整电路的环境温度为预设的温度时第四分压单元第一端的电压；所述热敏电阻为负温度系数的热敏电阻；Wherein the reference voltage is equal to a voltage of the first end of the fourth voltage dividing unit when the ambient temperature of the turn-on voltage adjusting circuit is a preset temperature; the thermistor is a thermistor with a negative temperature coefficient;
其中，所述第一分压单元、第二分压单元、第三分压单元、第四分压单元、第五分压单元、第六分压单元分别为第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、及第六电阻；The first voltage dividing unit, the second voltage dividing unit, the third voltage dividing unit, the fourth voltage dividing unit, the fifth voltage dividing unit, and the sixth voltage dividing unit are respectively a first resistor, a second resistor, and a first resistor a three resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
其中，所述控制单元为脉冲宽度调制芯片。Wherein, the control unit is a pulse width modulation chip.
本发明的有益效果：本发明提供的一种开启电压调整电路，包括开启电压输出单元、反馈电压侦测单元、及控制单元，其中，反馈电压侦测单元包括第一分压单元、第二分压单元、减法器、第一开关单元、第二开关单元、及温度反馈控制单元，在环境温度小于预设的温度时，温度反馈控制单元控制第一开关单元截止、第二开关单元导通，并向减法器的反相输入端输入温度补偿电压，减法器输出第一分压单元第二端的电压与温度补偿电压的差值至控制单元的反馈端，控制单元控制开启电压输出单元提高其输出的开启电压使控制单元反馈端的电压保持预设的反馈电压，能够在低温环境下升高开启电压，保证液晶显示装置在低温下能够正常显示。本发明提供的一种液晶显示装置，包括上述的开启电压调整电路，能够在低温环境下升高开启电压，保证在低温下能够正常显示。 The invention provides a turn-on voltage adjusting circuit, comprising: an open voltage output unit, a feedback voltage detecting unit, and a control unit, wherein the feedback voltage detecting unit comprises a first voltage dividing unit and a second minute The pressure unit, the subtractor, the first switch unit, the second switch unit, and the temperature feedback control unit, when the ambient temperature is less than the preset temperature, the temperature feedback control unit controls the first switch unit to be turned off, and the second switch unit is turned on, And inputting a temperature compensation voltage to the inverting input end of the subtractor, the subtractor outputs a difference between the voltage of the second end of the first voltage dividing unit and the temperature compensation voltage to the feedback end of the control unit, and the control unit controls the opening voltage output unit to increase the output thereof. The turn-on voltage keeps the voltage of the feedback terminal of the control unit at a preset feedback voltage, and can raise the turn-on voltage in a low temperature environment to ensure that the liquid crystal display device can display normally at a low temperature. The invention provides a liquid crystal display device comprising the above-mentioned turn-on voltage adjusting circuit, which can raise the turn-on voltage in a low temperature environment and ensure normal display at a low temperature.
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。The detailed description of the present invention and the accompanying drawings are to be understood,
附图中，In the drawings,
图1为本发明的开启电压调整电路的电路图。1 is a circuit diagram of a turn-on voltage adjusting circuit of the present invention.
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。In order to further clarify the technical means and effects of the present invention, the following detailed description will be made in conjunction with the preferred embodiments of the invention and the accompanying drawings.
请参阅图1，本发明提供一种开启电压调整电路，包括开启电压输出单元100、与开启电压输出单元100电性连接的反馈电压侦测单元200、及与反馈电压侦测单元200及开启电压输出单元100均电性连接的控制单元300；Referring to FIG. 1 , the present invention provides an open voltage adjustment circuit, including a turn-on
所述开启电压输出单元100用于输出开启电压VGH；The turn-on
所述反馈电压侦测单元200包括第一分压单元210、第二分压单元220、减法器230、第一开关单元240、第二开关单元250、及温度反馈控制单元260；所述第一分压单元210的第一端电性连接开启电压输出单元100的输出端接入开启电压VGH，第二端电性连接第二分压单元220的第一端；所述第二分压单元220的第二端接地；所述减法器230的同相输入端电性连接第一分压单元210的第二端，反相输入端电性连接温度反馈控制单元260的第一输出端，输出端电性连接第二开关单元250的第一端；所述第一开关单元240的控制端电性连接温度反馈控制单元260的第二输出端，第一端电性连接第一分压单元210的第二端，第二端电性连接控制单元300的反馈端；所述第二开关单元250的控制端电性连接温度反馈控制单元260的第三输出端，第二端电性连接控制单元300的反馈端；所述温度反馈控制单元260用于向减法器230的反相输入端输入一温度补偿电压，以及在所述开启电压调整电路的环境温度小于一预设的温度时控制第一开关单元240截止、第二开关单元250导通，在所述开启电压调整电路的环境温度大于等于所述预设的温度时控制第一开关单元240导通、第二开关单元250截止；The feedback
所述控制单元300用于在其反馈端的电压小于或大于一预设的反馈电压时向开启电压输出单元100输出对应的控制信号，对应控制开启电压输出单元100提高或降低其输出端输出的开启电压VGH的电压值直至其反馈端的电压等于所述预设的反馈电压。
The
具体地，所述温度反馈控制单元260包括：第三分压单元261、第四分压单元262、第五分压单元263、第六分压单元264、比较器265、第三开关单元266、及热敏电阻VR1；Specifically, the temperature
所述第三分压单元261的第一端接入第一恒定电压VL，第二端电性连接第四分压单元262的第一端；所述第四分压单元262的第二端电性连接第六分压单元264的第一端及减法器230的反相输入端；所述第五分压单元263的第一端接入电源电压VDD，第二端电性连接第三开关单元266的第一端；所述第六分压单元264的第二端接地；所述比较器265的同相输入端电性连接第三分压单元261的第二端，反相输入端接入参考电压Vref，输出端电性连接第二开关单元250的控制端；所述第三开关单元266的控制端电性连接比较器265的输出端，第一端电性连接第一开关单元240的控制端，第二端接地；所述热敏电阻VR1的第一端和第二端分别电性连接第四分压单元262的第一端和第二端。The first end of the third
具体地，所述参考电压Vref等于所述开启电压调整电路的环境温度为预设的温度时第四分压单元262第一端的电压；所述热敏电阻VR1为负温度系数的热敏电阻。Specifically, the reference voltage Vref is equal to the voltage of the first end of the fourth
具体地，所述第一开关单元240、第二开关单元250、第三开关单元266分别为第一场效应管Q1、第二场效应管Q2、及第三场效应管Q3；所述第一场效应管Q1的栅极为第一开关单元240的控制端，漏极为第一开关单元240的第一端，源极为第一开关单元240的第二端；所述第二场效应管Q2的栅极为第二开关单元250的控制端，漏极为第二开关单元250的第一端，源极为第二开关单元250的第二端；所述第三场效应管Q3的栅极为第三开关单元266的控制端，漏极为第三开关单元266的第一端，源极为第三开关单元266的第二端。具体地，第一场效应管Q1、第二场效应管Q2、及第三场效应管Q3均为N型场效应管。Specifically, the
具体地，所述第一分压单元210、第二分压单元220、第三分压单元261、第四分压单元262、第五分压单元263、第六分压单元264分别为第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4、第五电阻R5、及第六电阻R6。Specifically, the first
具体地，所述控制单元300为脉冲宽度调制芯片。Specifically, the
需要说明的是，现以本发明的优选实施例对本发明的开启电压调整电路的具体工作过程进行详细描述：当开启电压调整电路的环境温度大于等于所述预设的温度时，第三分压单元261的第二端的电压小于参考电压Vref，此时比较器265的输出端输出低电平，第二场效应管Q2截止，第三场效应
管Q3截止，第五分压单元263的第二端为电源电压VDD经第五分压单元263分压后的高电平，第一场效应管Q1导通，开启电压VGH经第一分压单元210分压后输入控制单元300的反馈端，此时若控制单元300反馈端的电压小于或大于预设的反馈电压，控制单元300输出对应的控制信号至开启电压输出单元100，使开启电压输出单元100对应增大或减小输出的开启电压VGH，使控制单元300反馈端的电压等于预设的反馈电压，进而第一分压单元210第二端的电压也保持在预设的反馈电压；当环境温度小于预设的温度时，热敏电阻VR1的电阻值增大，使第三分压单元261的第二端的电压大于参考电压Vref，此时比较器265的输出端输出高电平，第二场效应管Q2导通，第三场效应管Q3导通，第一场效应管Q1的栅极接地而截止，减法器230将第一分压单元210第二端的电压与第四分压单元262第二端的电压也即温度反馈电压进行减法运算，并将运算结果输入控制单元300的反馈端，而控制单元300能够控制开启电压输出单元100调整其输出的开启电压VGH的电压值，使控制单元300的反馈端的引脚保持预设的反馈电压，那么在环境温度小于预设的温度时，第一分压单元210第二端的电压等于预设的反馈电压与温度补偿电压之和，即此时第一分压单元210第二端的电压大于预设的反馈电压，而在环境温度大于等于预设的温度时，第一分压单元210第二端的电压是始终等于预设的反馈电压的，也即环境温度小于预设温度时开启电压输出单元100输出的开启电压VGH高于环境温度大于等于预设温度时的开启电压VGH，实现了在低温环境中升高开启电压，当该开启电压调整电路应用于液晶显示装置中时，能够保证液晶显示装置在低温下能够正常显示。It should be noted that the specific working process of the turn-on voltage adjusting circuit of the present invention is described in detail in the preferred embodiment of the present invention: when the ambient temperature of the voltage adjusting circuit is greater than or equal to the preset temperature, the third partial voltage The voltage of the second end of the
基于同一发明构思，本发明还提供一种液晶显示装置，包括上述的开启电压调整电路，能够在低温环境下升高开启电压，保证在低温下能够正常显示。在此不再对开启电压调整电路的结构进行赘述。Based on the same inventive concept, the present invention also provides a liquid crystal display device comprising the above-described turn-on voltage adjusting circuit capable of raising an open voltage in a low temperature environment to ensure normal display at a low temperature. The structure of the turn-on voltage adjustment circuit will not be described here.
综上所述，本发明的开启电压调整电路，包括开启电压输出单元、反馈电压侦测单元、及控制单元，其中，反馈电压侦测单元包括第一分压单元、第二分压单元、减法器、第一开关单元、第二开关单元、及温度反馈控制单元，在环境温度小于预设的温度时，温度反馈控制单元控制第一开关单元截止、第二开关单元导通，并向减法器的反相输入端输入温度补偿电压，减法器输出第一分压单元第二端的电压与温度补偿电压的差值至控制单元的反馈端，控制单元控制开启电压输出单元提高其输出的开启电压使控制单元反馈端的电压保持预设的反馈电压，能够在低温环境下升高开启电压，保证液晶显示装置在低温下能够正常显示。本发明的液晶显示装 置，包括上述的开启电压调整电路，能够在低温环境下升高开启电压，保证在低温下能够正常显示。In summary, the turn-on voltage adjusting circuit of the present invention includes a turn-on voltage output unit, a feedback voltage detecting unit, and a control unit, wherein the feedback voltage detecting unit includes a first voltage dividing unit, a second voltage dividing unit, and a subtraction method. The first switching unit, the second switching unit, and the temperature feedback control unit, when the ambient temperature is less than the preset temperature, the temperature feedback control unit controls the first switching unit to be turned off, the second switching unit to be turned on, and to the subtractor The inverting input terminal inputs a temperature compensation voltage, and the subtracter outputs a difference between the voltage of the second end of the first voltage dividing unit and the temperature compensation voltage to the feedback end of the control unit, and the control unit controls the opening voltage output unit to increase the opening voltage of the output. The voltage at the feedback end of the control unit maintains a preset feedback voltage, which can raise the turn-on voltage in a low temperature environment, and ensure that the liquid crystal display device can display normally at a low temperature. Liquid crystal display device of the invention The above-mentioned turn-on voltage adjusting circuit can raise the turn-on voltage in a low temperature environment to ensure normal display at a low temperature.
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。 In the above, various other changes and modifications can be made in accordance with the technical solutions and technical concept of the present invention, and all such changes and modifications should be included in the appended claims. The scope of protection.
Claims (11)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710589082.1 | 2017-07-19 | ||
| CN201710589082.1A CN107464534B (en) | 2017-07-19 | 2017-07-19 | Cut-in voltage adjustment circuit and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2019015184A1 true WO2019015184A1 (en) | 2019-01-24 |
Family
ID=60544429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2017/111426 Ceased WO2019015184A1 (en) | 2017-07-19 | 2017-11-16 | Threshold voltage regulator circuit and liquid crystal display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107464534B (en) |
| WO (1) | WO2019015184A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108806633A (en) * | 2018-07-09 | 2018-11-13 | 深圳市华星光电半导体显示技术有限公司 | The start-up control method and liquid crystal display device of liquid crystal display device |
| CN110097859B (en) * | 2019-04-10 | 2020-10-13 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN116721642B (en) * | 2023-06-30 | 2025-07-11 | 惠科股份有限公司 | Driving circuit and driving method of display panel and display panel |
| CN117975900B (en) * | 2024-01-31 | 2025-12-09 | Tcl华星光电技术有限公司 | Power management system and display device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330252A (en) * | 2007-06-19 | 2008-12-24 | 钰瀚科技股份有限公司 | DC-DC converter with temperature compensation circuit |
| KR20110096424A (en) * | 2010-02-22 | 2011-08-30 | 엘지디스플레이 주식회사 | Temperature compensation circuit and liquid crystal display device having same |
| CN102169680A (en) * | 2011-03-04 | 2011-08-31 | 深圳市华星光电技术有限公司 | Liquid crystal display module and adjustment method of response speed thereof |
| CN203456073U (en) * | 2013-07-25 | 2014-02-26 | 北京京东方光电科技有限公司 | Temperature feedback adjusting circuit and display device |
| CN103869866A (en) * | 2012-12-14 | 2014-06-18 | 力智电子股份有限公司 | Reference voltage generator of grid drive circuit and reference voltage generating method |
| CN105099189A (en) * | 2015-07-17 | 2015-11-25 | 深圳市华星光电技术有限公司 | Voltage compensation circuit and voltage compensation method based on voltage compensation circuit |
| CN105390112A (en) * | 2015-12-14 | 2016-03-09 | 深圳市华星光电技术有限公司 | Thin film transistor gate voltage supply circuit |
-
2017
- 2017-07-19 CN CN201710589082.1A patent/CN107464534B/en active Active
- 2017-11-16 WO PCT/CN2017/111426 patent/WO2019015184A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330252A (en) * | 2007-06-19 | 2008-12-24 | 钰瀚科技股份有限公司 | DC-DC converter with temperature compensation circuit |
| KR20110096424A (en) * | 2010-02-22 | 2011-08-30 | 엘지디스플레이 주식회사 | Temperature compensation circuit and liquid crystal display device having same |
| CN102169680A (en) * | 2011-03-04 | 2011-08-31 | 深圳市华星光电技术有限公司 | Liquid crystal display module and adjustment method of response speed thereof |
| CN103869866A (en) * | 2012-12-14 | 2014-06-18 | 力智电子股份有限公司 | Reference voltage generator of grid drive circuit and reference voltage generating method |
| CN203456073U (en) * | 2013-07-25 | 2014-02-26 | 北京京东方光电科技有限公司 | Temperature feedback adjusting circuit and display device |
| CN105099189A (en) * | 2015-07-17 | 2015-11-25 | 深圳市华星光电技术有限公司 | Voltage compensation circuit and voltage compensation method based on voltage compensation circuit |
| CN105390112A (en) * | 2015-12-14 | 2016-03-09 | 深圳市华星光电技术有限公司 | Thin film transistor gate voltage supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107464534A (en) | 2017-12-12 |
| CN107464534B (en) | 2019-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102318058B1 (en) | GOA circuit overcurrent protection system and method | |
| US9659540B1 (en) | GOA circuit of reducing power consumption | |
| CN102915713B (en) | Grid voltage temperature compensation circuit and method, and display device | |
| CN103137072B (en) | External compensation induction circuit, induction method of external compensation induction circuit and display device | |
| TWI463459B (en) | Flat panel display and threshold voltage sensing circuit thereof | |
| WO2019015185A1 (en) | Clock signal output circuit, and liquid crystal display device | |
| WO2019227807A1 (en) | Goa circuit | |
| WO2019015184A1 (en) | Threshold voltage regulator circuit and liquid crystal display device | |
| US20210116740A1 (en) | Startup control method for liquid crystal display device and liquid crystal display device | |
| WO2020093466A1 (en) | Driving method, driving circuit, and display device | |
| US11094271B2 (en) | Driving circuit of display panel and display device | |
| US10210831B2 (en) | Drive method of liquid crystal display device and liquid crystal display device | |
| WO2020206770A1 (en) | Display panel and display device | |
| US10074337B2 (en) | Chamfering circuit of adjustable chamfered waveform and adjust method of chamfered waveform | |
| CN110148390A (en) | Array substrate, its driving method and display device | |
| US10510297B2 (en) | Pixel circuit, driving method thereof, display panel and display device | |
| CN204360353U (en) | Buffer cell, touch drive circuit and display device | |
| KR20090072779A (en) | Photosensor and driving method | |
| TWI498867B (en) | Image display systems, sensing circuits and methods for sensing and compensating for a threshold voltage shift of a transistor | |
| JP6823758B2 (en) | Output voltage adjustment circuit and liquid crystal display device | |
| CN107622759A (en) | Pixel control circuit and control method thereof, display | |
| CN213025343U (en) | Time sequence control circuit and display device | |
| WO2019061729A1 (en) | Display device and drive method therefor | |
| WO2019061730A1 (en) | Display device and drive method therefor | |
| US11138948B2 (en) | Voltage stabilization circuit, control method, and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17918574 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 17918574 Country of ref document: EP Kind code of ref document: A1 |